#region The MIT License
// The MIT License
// 
// Copyright (c) 2009 octalforty studios
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#endregion
using System;
using System.Collections.Generic;
using System.Reflection;
using NUnit.Framework;
using octalforty.Componento.ComponentModel.Commands;
using octalforty.Componento.Properties;

namespace octalforty.Componento.Tests.Componento.ComponentModel
{
    [TestFixture]
    public class HelpCommandTestFixture
    {
        #region AllCommandsHaveHelpMessageEntities Helper

        private static IEnumerable<String> GetHelpPropertiesNames(Type type)
        {
            PropertyInfo[] properties = type.GetProperties(BindingFlags.NonPublic | BindingFlags.Static);
            foreach (PropertyInfo property in properties)
            {
                yield return property.Name.ToLower();
            }
        }

        private static void CheckCommandHaveHelpMessages(Type command, ICollection<string> properties)
        {
            CommandMetadataAttribute attr = (CommandMetadataAttribute)Attribute.GetCustomAttribute(command, typeof(CommandMetadataAttribute));
            String commandName = attr.Name;
            if (!properties.Contains(commandName))
                throw new HelpPropertyMissedException(commandName);
            String verboseCommandName = String.Format("{0}_verbose", commandName);
            if (!properties.Contains(verboseCommandName))
                throw new HelpPropertyMissedException(commandName);
        }

        private static IEnumerable<Type> GetCommandModulesByAssembly(Assembly assembly)
        {
            foreach (Type type in assembly.GetTypes())
            {
                if (Attribute.IsDefined(type, typeof(CommandMetadataAttribute)))
                    yield return type;
            }
        }

        #endregion
        
        [Test(Description = "Check that all commands have short and verbose messages")]
        public void AllCommandsHaveHelpMessageEntities()
        {
            IEnumerable<Type> commandModules = GetCommandModulesByAssembly(typeof (HelpCommand).Assembly);
            List<string> propertiesNames = new List<String>(GetHelpPropertiesNames(typeof(HelpMessages)));
            foreach (Type command in commandModules)
            {
                CheckCommandHaveHelpMessages(command, propertiesNames);
            }
        }
    }

    internal class HelpPropertyMissedException : NotImplementedException
    {
        public HelpPropertyMissedException(string name) : base(name)
        {
        }
    }
}